A teacher wants to select the class monitor in a class of 30 boys and 20 girls . In how many ways can the monitor be selected if the monitor must be a girl ? (Use fundamental theorem of counting from lesson permutation and combination )
Answers
Answered by
34
Class monitor is one position, and We need to determine how many ways of selecting a class monitor.
The Class has 30 boys and 20 girls.
The condition here is that, Class monitor must be a girl. So, The class monitor can be from girls only.
Now We have 20 girls, and anyone of them can be the class monitor.
Obviously, One out of 20 girls would mean that we have 20 ways to choose a class monitor from class such that, Class monitor is a girl.
Conclusion : There are 20 different ways to choose a class monitor such that class monitor is a girl.
Answered by
8
Answer:
50 ways
Step-by-step explanation:
- with the help of addition principle we can find the number of ways the monitor to be selected as a girl
- As in the question it is asked how many so sum of all the students in the class which would include boys too
- so 30+20=50(addition principle)from lesson permutations and combinations
- therefore,in 50 ways the monitor can be selected if the monitor must be a girl
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